3 Answers

When I wanted better sound for my Cougar XR7 (4.6L) I went with the Flowmaster Super 40's, they're stainless steel, and sound very good, make sure you check a local shop or Summit Racing online, they're way too expensive on the Flowmaster site, also since they're stainless steel you can't just use clamps to attach them, they have to be welded (stainless doesn't crimp at all)
they were about $80-$90 dollars each when I got them, total install where I went was $250 (labor and mufflers, brackets) I also kept the original tips (turn downs) for a stock/muscle car look
I don't know what to use on a Lexus tho

I just got a 63 impala and i want to make it a cruiser, so i want to get the best gas milage possible. ITs a 283 and i was thinking about replacing the stock manifolds for some performance ones to im...